Two constituencies form the backbone of a journal and act as stewards of its quality. One is the Editorial Board, whose judgments on the quality of manuscripts shape a journal signifi cantly and set the tone for its direction. Equally important, but perhaps not as externally visible, is the body of external reviewers who are called upon to review manuscripts. The IEEE Transactions on Mobile Computing (TMC) is very fortunate to have more than 1,200 dedicated reviewers whose service to the journal is one of the major factors that contributes to TMC's standing as an academic publication. These reviewers collectively completed nearly 1,800 reviews in 2012 alone, and their thoroughness in reviewing manuscripts has been exemplary. The IEEE has recently initiated a Reviewer Appreciation Program for its publications to highlight reviewers who have gone beyond the call of duty, both in contributing signifi cant amounts of their time to reviewing manuscripts for TMC and also in the quality of their reviews. It is our great pleasure to recognize the individuals listed as distinguished reviewers for TMC for the year 2012.